543.dk is a .dk domain served by 3 nameservers (ns4.dns-123.net, ns5.dns-123.net, ns6.dns-123.net). It was already in the .dk zone when our tracking began on 16 June 2026. Its website address 5.103.46.101 is hosted by FIBIA P/S (AS44869) in Denmark. Mail is handled by mail.protonmail.ch, mailsec.protonmail.ch. The zone is DNSSEC-signed and validates, publishes a DMARC policy and has no IPv6 address. Below are all of its DNS records from this scan: nameservers, A/AAAA, MX, TXT, SPF, DMARC, CAA, TLSA/DANE, MTA-STS, SRV and more.
| Nameserver | IP addresses | PTR | ASN / ISP |
|---|---|---|---|
| ns4.dns-123.net | — | — | — |
| ns5.dns-123.net | — | — | — |
| ns6.dns-123.net | — | — | — |
| IP | TTL | PTR | ASN | ISP / Org | CIDR | Country | City |
|---|---|---|---|---|---|---|---|
| 5.103.46.101 | — | server6101.serverpark.dk | AS44869 | FIBIA P/S | 5.103.0.0/16 | 🇩🇰 Denmark | — |
| TXT Record |
|---|
| protonmail-verification=869189d6705ffb3de3906eb6c647c6143969b7d4 |
| v=spf1 include:_spf.protonmail.ch ~all |
| Policy | Record (543.dk) |
|---|---|
| ~all (soft fail) | v=spf1 include:_spf.protonmail.ch ~all |
| Policy | Record (_dmarc.543.dk) |
|---|---|
| p=quarantine | v=DMARC1; p=quarantine |
| www | 5.103.46.101 (AS44869) (address records, no CNAME) |
| www vs bare domain | Same network |
| Wildcard | Yes: any name under the zone resolves |
| Denial of existence | NSEC zone can be walked (all names enumerable) |
| CDS / CDNSKEY | None 0 CDS, 0 CDNSKEY |
DNS lookups: 2/10 · policy: ~all
No problems found| Service / Owner | Type | Cert association |
|---|---|---|
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| SMTP _25._tcp.mail.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 6111A5698D23C89E09C36FF833C1487E… |
| SMTP _25._tcp.mailsec.protonmail.ch | DANE-EE · SPKI · SHA-256 | 76BB66711DA416433CA890A5B2E5A053… |
| Check | Result |
|---|---|
| Validation Status | 🔒 Secure |
| AD Flag (resolver validates) | ✓ Set |
| DS Record | ✓ Found |
| DNSKEY Record | ✓ Found |
| Flags | fully validated |
| Field | Value |
|---|---|
| Serial | 2024021101 |
| Primary NS (MNAME) | ns4.dns-123.net |
| Responsible (RNAME) | admin@dns-123.net |
| Refresh | 28800s |
| Retry | 7200s |
| Expire | 604800s |
| Minimum (neg-cache TTL) | 300s |
| Scanned At | Duration | Records | DNSSEC |
|---|---|---|---|
| 2026-10-02 13:43:28 | 740ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-09-30 22:46:20 | 840ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-22 06:52:34 | 1150ms | 3 NS 1 A 2 MX | 🔒 Secure |
| 2026-06-21 23:51:35 | 926ms | 0 NS 0 A 0 MX | ❓ Unknown |
| 2026-06-16 13:14:24 shown | 932ms | 3 NS 1 A 2 MX | 🔒 Secure |